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Plaesiomyidae
Plaesiomyidae
is a
family
of
extinct
lamp shells
belonging
to the order
Orthida
.
Fossil
record
Fossils
of Plaesiomyidae are found in
marine
strata
from the
Ordovician
until the
Silurian
.
Genera
†
Austinella
Foerste,
1909
†
Bokotorthis
Popov
et
al
.
,
2000
†
Campylorthis
Ulrich
and Copper,
1942
†
Chaulistomella
†
Dinorthis
Hall
and
Clarke
,
1892
†
Evenkina
†
Madiorthis
Zuykov
and
Harper
,
2008
†
Metorthis
†
Multicostella
†
Plaesiomys
Hall and Clarke, 1892
†
Retrorsirostra
Schuchert
and
Cooper
,
1932
†
Valcourea